Quote:
Originally Posted by
baker
great , now i am getting to it ..
but my understanding was , from transport to network layer , the only data that passing is TCPheader+data , and in this IP address is not available though.
The layers are inside each other, like a Matryoshka. The data link layer doesn't
understand the Transport Layer data, but it's there nonetheless.
You might consider a packet to be a wad of data which looks like this:
Quote:
Data Link Layer(usually Ethernet)
It usually gets passed around whole. OSI might speak of peeling layers but that's a metaphor; if it's a signal going over a wire, it's going to be transmitted whole.